Use Skylark version of http_archive. (#155)

diff --git a/README.md b/README.md
index a5c3835..7fbc25b 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,8 @@
 this:
 
 ```build
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
 rules_kotlin_version = "67f4a6050584730ebae7f8a40435a209f8e0b48e"
 
 http_archive(
diff --git a/WORKSPACE b/WORKSPACE
index 3627fc0..e245aac 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -27,6 +27,8 @@
     url = "https://github.com/hsyed/bazel-deps/releases/download/v0.1.0/parseproject_deploy.jar",
 )
 
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
 http_archive(
     name = "bazel_toolchains",
     sha256 = "af577935530a3b5a1be02170682b1a0f6fa08641ff5b7785e44afd1435bce75a",